834
Anal. Chem. 1984, 56,834-835
and S042-could be determined by a 100-fold dilution of seawater. H2P04-and NOT were coeluting just after C1- (Table I). They were observed as a small shoulder in Figure 1and Figure 2 but could not be determined separately. It is under study to separate these ions. Comparing this ion chromatographic method with the colorimetric and titrimetric methods currently used to determine these ions, one finds that the ion chromatographic method is so simple and rapid that it is quite preferable for the simultaneous determination of part-per-million levels of metal cations and anions for environmental analyses of water samples. Registry No. Mg, 7439-95-4;Ca, 7440-70-2; C1-, 16887-00-6; NO
